/Engine/Source/Editor/Kismet/Public/BlueprintEditorModule.h
Gets the extensibility managers for outside entities to extend blueprint editor's menus and toolbars
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FExtensibilityManager](API\Editor\UnrealEd\Toolkits\FExtensibilityManager) > GetMenuExtensibilityManager()